The materials which allow heat to pass through them easily are conductors of heat. For examples,aluminum, iron, and copper.
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The answer is A, neon.
The reason for this is because neon is a noble gas, which means that it doesn't react with other elements as well.
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C or d because ik it’s not consolidated
-they are all odorless, colorless, monatomic gases with very low chemical reactivity.
-they’re all found in group 18 on the periodic table, all the way on the far right.
-they are the only elements that are unable to form compounds.